664161293 has 2 divisors, whose sum is σ = 664161294. Its totient is φ = 664161292.

The previous prime is 664161241. The next prime is 664161301. The reversal of 664161293 is 392161466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384669769 + 279491524 = 19613^2 + 16718^2 .

It is a cyclic number.

It is not a de Polignac number, because 664161293 - 2¹⁴ = 664144909 is a prime.

It is a super-2 number, since 2×664161293² = 882220446238863698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664161493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332080646 + 332080647.

It is an arithmetic number, because the mean of its divisors is an integer number (332080647).

Almost surely, 2^664161293 is an apocalyptic number.

It is an amenable number.

664161293 is a deficient number, since it is larger than the sum of its proper divisors (1).

664161293 is an equidigital number, since it uses as much as digits as its factorization.

664161293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 664161293 is about 25771.3269545827. The cubic root of 664161293 is about 872.4847682773.

The spelling of 664161293 in words is "six hundred sixty-four million, one hundred sixty-one thousand, two hundred ninety-three".